[git_auth] Auto configure global config also

Bug: b/351071334
Change-Id: I069443a74cf7e33ce9ebea53ea3d52e272ed3570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5740605
Commit-Queue: Allen Li <ayatane@chromium.org>
Reviewed-by: Yiwei Zhang <yiwzhang@google.com>

git_auth.py

@@ -243,7 +243,7 @@ def AutoConfigure(cwd: str, cl: git_cl.Changelist) -> None:
         logging.debug(
             'Automatically configuring Git repo authentication'
             ' (current version: %r, latest: %r)', v, latestVer)
-        ConfigureRepo(cwd, cl)
+        Configure(cwd, cl)
         scm.GIT.SetConfig(cwd, 'depot-tools.gitAuthAutoConfigured',
                           str(latestVer))
 
@@ -278,13 +278,6 @@ def Configure(cwd: str, cl: git_cl.Changelist) -> None:
     c2.apply(cwd)
 
 
-def ConfigureRepo(cwd: str, cl: git_cl.Changelist) -> None:
-    """Configure the current Git repo authentication."""
-    logging.debug('Configuring current Git repo authentication...')
-    c = ConfigChanger.new_from_env(cwd, cl)
-    c.apply(cwd)
-
-
 def ClearRepoConfig(cwd: str, cl: git_cl.Changelist) -> None:
     """Clear the current Git repo authentication."""
     logging.debug('Clearing current Git repo authentication...')